Changed package naming across all examples.

service-layer/src/main/java/com/iluwatar/servicelayer/common/BaseEntity.java

@@ -0,0 +1,19 @@
+package com.iluwatar.servicelayer.common;
+
+import javax.persistence.Inheritance;
+import javax.persistence.InheritanceType;
+import javax.persistence.MappedSuperclass;
+import javax.persistence.Version;
+
+/**
+ * 
+ * Base class for entities.
+ *
+ */
+@MappedSuperclass
+@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
+public class BaseEntity {
+	
+	@Version
+	private Long version;
+}